All you need to know about testing Free Testosterone levels with a laboratory test
19.0% of people tested have Free Testosterone levels which are too low.
And 19.0% have levels that are too high.
The average Free Testosterone result is 0.3 nmol/L
Note what is normal for you may differ for your age and sex.
Free testosterone is a specific form of the hormone testosterone that is not bound to proteins in the bloodstream.
In adult men, it plays vital roles in several physiological processes, such as maintaining muscle strength, bone density, and influencing levels of aggression and fertility, including healthy sperm production.
By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure Free Testosterone for total reassurance.
Professional analysis in an accredited laboratory ensures rapid result delivery.
The Vitall Free Testosterone & SHBG nurse or clinic test kit includes a Free Testosterone test and is available for just £79.00.
Tests which include a Free Testosterone test:
Excess testosterone can be associated with increased body hair, acne, mood fluctuations, aggression, reduced sperm count or infertility, hypertension (high blood pressure), and possible heart or liver complications.
Naturally occurring high testosterone levels are uncommon. Elevated testosterone levels are more often linked to anabolic steroid use.
In males, raised testosterone levels may indicate testicular or adrenal gland disorders. These findings are generally treated as significant and are often reviewed further to clarify the cause.
In women, elevated testosterone levels may be linked to polycystic ovary syndrome (PCOS) or problems affecting the ovaries or adrenal glands. These findings are often reviewed further to clarify the cause.
High free testosterone levels may be expected in people taking testosterone supplements, but interpretation can be complex because multiple factors can influence testosterone levels.
A high level is typically shared with the clinician who requested the blood test or with a GP.
Several factors can be associated with low free testosterone levels. Key considerations include:
Low testosterone is sometimes treated with supplementation, including patches or injections. Identifying the underlying cause is generally considered important before treatment begins.
Some individuals also look at other sex and fertility hormone results through this test.
Test results are often shared with a GP or the medical practitioner who requested the test.
Measure your Free Testosterone levels and assess your free androgen index (fai) for optimum control with a Free Testosterone & SHBG nurse or clinic finger-prick bloodtest kit
You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.
This Free Testosterone & SHBG Test is advised if you:
The Free Testosterone test kit provides reliable results when used correctly. The test is conducted in a UKAS-accredited lab with careful analysis by medical professionals. However, no test is 100% foolproof and there may be occasional false positives or negatives.
Dr. Shahzaib Ahmad MBBS, BSc, MRCP, FRCA, FFICM
Clinical Supervisor - Vitall|GMC 7495062|Profile
Reviewed on 03/02/2026
Next review due 03/02/2027
Review focus: Blood biomarkers, laboratory testing methodology, and biochemical interpretation.
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Free Androgen Index